Furnace-door



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, L.F. JOHNSON.

, PURNAGB DOOR.

No. 297,808.. Patented Aprir29y1884.

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I A t y Y UNITED STATESPATENT OFFICE.

LUMAN F. JOHNSON, OF CLEVELAND, OHIO.'

\ FuRNAcE-DooR.

SPECIFICATION forming part of Letters Patent No. 297,808, dated Apr1'29, 1884.

Application tiled December 3, 1883. (No model.)

To all whom, it may concern.- A

Be it known that I, LUMAN F. JOHNSON, a citizen of the United States, residing in Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Furnace-Doors, of which the following is a specification.

My invention relates to furnace-doors which are suspended by a chain or its yequivalent so as to bev closed or opened by being raised or lowered in the usual lWay and by the ordinary means in use for such purposes. Y Such doors are subjected to a great heat all the time they are in use, and many devices have been made and tried with the object of getting something that will stand the intense heat and hard work they are subjected to.

The objectof my invention is to produce a door having the fire-brick only exposed to the heat, the construction being such that themetallic portion of the door by which the rebrick are held in place" is exposed to as little heat as possible, all of which will be fully and clearly hereinafter shown by reference to the accompanying drawings, in which- Figure l is a front or outside view of the door. Y Fig. 2 is a top orend View of the same. Fig. 3 represents a bottom or lower edge View. Fig. 4 is an inside face view of the door; and Fig. 5 is a detached section througlra portion of the door and angle-plate for holding the Y bricks in place.

The metallic portion a or frame for hol-ding the hre-brick in place is provided with a holding-piece, a', bolted to the .same by bolts a2. It is provided with an eye, a3, through which the bolt passes that connects it to the end of the chain by which the door is suspended and held in place; but as this part'of the device is in common use and well known, a further description of it here is unnecessary. The holding-piece a is formed so as to project over the top of the door and hold the bricks in place at that point. (See a4 in Fig. 2.)

c5 represents the tire-bricks, of which there may be more or less than the number shown.

The frame c is provided with a dovetailshaped opening or side pieces, b b', and the sides of each, brick are provided with a groove, b2, of corresponding shape, so that the bricks can be made to slide in place.

A The side pieces, b b', (or opening,) may be made of any form adapted to hold the brick in place, the grooves in their sides being made to correspond.

c represents an angular holding-piece for securing and holding the bottom brick in place. The part c is bolted to the frame or plateaby a bolt, c', and the portion c2 projects downward into a recess in the brick, (see Fig. 5,) thereby holding it firmly in place and securing all the bricks above it.

c is a modified device forl the same purposes. It is also an angle-plate, the portion c4 being bolted to the door frame or plate a by bolts c5,

and the lower portion (which is formed at right angles to the part c4) projects so as to rest against the bottom edge of the door and brick, thereby holding the bricks in place. It is provided with air-holes e, which lead to holes e in the doorp1ate. These holes lead into an air-space, f. (See Fig. 2.)

The object of the holes e is to permit a current of air to pass into the airspace and up out of the top of the door, and thereby carry off a portion of the heat, so vas to keep the casting or door-plate and bricks cool. By this construction the face of the brick only is presented to the fire, and when a brick is burned or otherwise rendered useless it (or all of the brick) may be easily taken out and new ones put in their place when required.

'l claim as my invention- A furnace-door consisting of the casting or plate a, having the side pieces, b b', and the airspace f and holes e', in combination with the bricks a5 and holding-pieces a and c, substantially as and for the -purposes described.

LUMAN F. JOHNSON. Witnesses:

O. B. PERDUE, I. L. GLEEsoN. 

